FlightGear - Flight Simulator FGAddon

Work in progress!
Housekeeping: Change folder structure according to wiki [[Standard_aircraft_structure]]
* Moved Models/source files/* to Resources/
* Moved more files to Resources/
* Added metadata tags to Citation-II-common.xml
* created MPModel directory. ToDo: Create a low resource version of the Citation II for MP
* Added thumbnail.txt

Updates
* Fine tuning strobe lights range on Rembrandt
* Adjusted Rembrandt lights to show up at lower lights-settings (shader-settings)
* Added german translation of <long-description>
* Added <sim><aircraft-operator> to livery xml's